These companions grow very quickly, though not to a very great size. In under a year, they have reached their full size, and are still small enough to comfortably wrap themselves around their magi's shoulders. When not hitching a ride from their magi, these wyrms are underground, moving through one of their many tunnels. Tame topo wyrms are more likely to surface from the safety of the tunnels, and often do so to dig around in the gardens. They eat a variety of bugs, and occasionally roots. They are very particular to fruits, which are very difficult for them to procure. When rewarded with sweet fruits, topo wyrms can be taught many things, most commonly to wrap around an object. A few magi pride themselves on training their topo wyrms to do more unusual tricks. The most popular of these is a woman who taught her wyrm a wriggly dance that never fails to get a laugh from students.

In the wild, topo wyrms are rarely seen above ground. They prefer to remain beneath the earth, moving at great speed through tunnels. Though these tunnels can be created in mere moments, most topos move through passages that already exist. These underground labyrinths have never been fully explored, but they can be found almost anywhere, even below the castle. Topo wyrms have tails and wing tips that are made of very strong, thick membranes. They use them to pad down soil as they dig, creating strong dirt walls. Though these companions are nearly blind, their other senses make up for it. They can identify types of soil through smell alone, and can avoid large rocks easily. Topo wyrms can also feel the slightest of vibrations through the ground, alerting them to any possible predators. To warn off attackers, topo wyrms thump their tails very loudly. If this sound is not heeded, topos use their tails in order to trip their enemies, or whack them repeatedly. These companions also possess a sharp set of teeth, which can shred through most materials with ease. Luckily for humans, topo wyrms are generally peaceful, and are tamed very easily. They are docile and curious in nature, and small enough to curl around their magi's shoulders.